Die casting dies



Dec.. 16, 1941. ll.. H. MORIN ETAL 2,256,433

DIE CASTING DIES Filed nach 4, 1959 40/ r ATTORNEY- Patented Dec. 16,1941 Dm cAsmG pms Y Louis H. Morin and Davis Marinsky, Bronx, N. Y.,assignors to Whitehall Patents Corporation, Bronx, N. Y., a corporationof New York Application March 4,1939. semi Ne. 59,816

(ci. isi-42) 3 Claims.

This invention relates to dies for use in die casting machines whereinheated thermoplastic material is injected from dual cylinders or nozzlesinto the impression of the dies in forming resulting die castings, eachcomposed of two diiierent casting materials, or materials of differentcolors. More particularly the invention relates to a die structurewherein two impressions are formed on adjacent surfaces of relativelymovable dies with gates arranged on the parting line of the dies openinginto said impressions, and further wherein one impression is smallerthan the other and said other impression shaped to receive the castingformed in the iirst impression so that the cast body formed in thesecond or larger impression will be arranged upon and united with therst mentioned casting arranged therein in producing two colored diecastings. The novel features of the invention will be best understoodfrom the following description when taken together with the accompanyingdrawing, in which certain embodiments of the .invention are disclosedand in which the separate parts are designated by suitable referencecharacters in each of the views, and in which:

Fig. 1 is a diagrammatic plan view showing dies in a closed positionandindicating the arrangement of injection nozzles thereon.

Fig. 2 is a sectional view on the line 2-2 of Fig. 1 indicating theformation of castings in the impressions of the dies.

Fig. 3 is a section on the line- 3-3 of Fig. 2 showing the dies in'openposition with the castings ejected and moved by a core pin employed.

Fig. 4 is a view similar to Fig. 3 showingthe dies in closed positionand indicating the castings formed therebetween.

Fig. 5 is a face viewof one die part showing the impressions and gatepassages therein.

Fig. 6 is a view similar to Fig. 2 showing a modied form of die forproducing other types of castings, and

Fig. 7 is a sectional view of the, resulting casting formed from the dieshown in Fig. 6.

This application is a continuation in part of our prior application No..144.627, iiled May 25, 1937, now Patent No. 2,234,185 and of our priorapplication No. 258,928, led February 28, 1939, and embodying' adivision of the subject matter originally covered in said applications.The construction shown in Figs. 1 to 5 inclusive in the presentapplication relates to the die structure of the earlier applicationidentified above, whereas the structure shown in Figs. 6 and 7 is based55 on the die structure illustrated in the second mentioned application.

In Figs. 1 to 5 inclusive, III,` lilarepresents relatively movable dieswhich are arranged in and operated by suitable means in a die castingmachine -so as to move toward and from each other and to be firmly heldin engagement with each other in the casting operation to separate inejecting the casting on a core pin II and then partially closed instripping vthe castings from the core pin. Each die part has on adjacentsurfaces thereof two impressions I2, I3 which are spaced apart, theimpression I2 being smaller than the impression I3 andthe impression I3being so shapedas to receive the casting I4 formed in the impression I2in successive casting operations of the machine. The enlarged portion ofthe impression I3 forms a cast body I5 directly upon the casting Il,when arranged in the impression, and it is preferred that a dove-tailedtongue or other keying means Ila be provided on the cast body I4 so thatthe cast body I5 will interlock therewith as will be apparent.

In the construction shown, the resulting twopart casting, which isrepresented at I5 in Fig. 2 of the drawing, isin the form of a pull suchas usedA on the sliders of separable fasteners, but of course it will beunderstood that any type or kind of casting can be produced inaccordance I with the invention, the cavities or impressions jI 2, I3being shaped to produce the desired iinished product.

On the-parting line of the dies I0, Ilia is a single admission orice I1which opens into branches I8 andIS extending to each impression,

so that when heated thermoplastic material is injected under pressurefrom a nozzle 2li into the gate passages Il, I8 and I9, the two castbodies I4 and I5 will simultaneously be formed. For

illustrative purposes we will assume that this material is red in color,.then the two cast bodies I4 and I5 will be red. Another nozzle'orcylinder 2| containing a blue 'thermoplastic material is next moved intoregistering position with the orifice or passage I'I so that the nextsuccessive casting will have the bodies I4, I5 cast in blue, as isclearly illustrated and understandable from the showing in Fig. 2 ofthedrawing.

The impression I2, or each half of the impression is provided withinwardly projecting tongues forming core pieces 22 which form anaperture 23 in the resulting casting, that is to say, in the part I4thereof. The impression I3 has similar core portions 2l to 'registerwith the formed aperture 2l when the part I4 is moved into theimpression,

and if desired, other similar cores 25 may be vprovided in theimpression I3 to form on the resulting casting an aperture 26 in thepart I5. It will appear from a consideration of Figs. 2 and 5 of thedrawing that the lower portions of each die part I0, Illa is providedwith a diagonal gate I8a similar to the branch I 8 so as to receive the,gate which remains on the partfl2 when moved into the impression I 3.'.This gate, including the gate formed as at I9, are trimmed from theresulting casting. Adjacent surfaces of the die parts I0, I'IIa are alsoprovided with an aperture 2l leading into the impression I2 forreceiving the pin II which acts as an ejector pin in removing thecastings from the die parts when the die parts are separated and also tofeed the cast body I4 into position to enter the impression I3.'

Each of the die parts are provided with water circulating passages .28as indicated in Figs. 3 and 4 of the drawing for the circulation ofWater or another cooling agent through the dies adjathe companion diepart will be of the same construction in accordance with the, teachingsin Figs. l to 5 inclusive; therefore, the showing of the two die partsis not deemed to be essential. Arranged on the surface of each of thedie parts in question is an impression into which extends a cylindricalbore or passage 3I for the reception of a headed pin or other supportthat is partially indicated at 32 in Fig. 7 of the drawing, upon whichone cast body 33 of the contour of the impression 30 is to be formed.Also opening Vinto one side of the impression 30 is a gate or admissionpassage 34 which opens through one side of the die in an admission port35 with which one injection nozzle 36 is adapted to register so that aheated thermoplastic material may be pressure discharged from thecylinder 31 into the port 35 and gate 34 and thus into the impression30. The impression 30 is alsoy preferably provided with a dove-tailedrecess 30a centrally of one surface thereof to form on the re-Y sultingcasting an anchor portion 33a for keying and positively retaininganother cast body 38 on the body 33. The body 3B is formed in an'impression 39 when one of the cast bodies 33 is arranged in saidimpression 39. A pin receiving passage 3Ia similar to 3l also extendsinto the impression 39, and a supplemental gate passage 34a extends intothe impression 3Ia so as to receive the gate 40 which is integral withthe body 33 when the latter is moved into the impression 39.

' .A gate or admission passage 4I is provided on the surfacesl of thedies and opens into the impression 39 substantially in alinement withthe passage 3| but at the opposite side of the die so as to extend tothat part of the impression 39 which will form the cast body 38. Anothernozzle 36a Ais adapted to register with the gate passage 4I so thatheated casting material from a cylinder 31a may be pressure dischargedinto the irnpression 39 to form the cast body 39 simultaneously informing the body 33 in the impression 30. In some instances, the pin. 32upon which the cast bodies are formed may be used as.

the ejector pin to remove the castings from the dies when the latter areseparated, and also to feed the castings. However, when forming castingson pins or other members of relatively light construction, it will bedesirable to use an ejector or feed pin substantially similar to the pinIl. For this purpose, the adjacent surfaces of the dies are providedwith a vertical passage 42 which .extends into the gate passage 34 andanother v passage 43 which extends between the gate passage 34 and intothe passage 4I so that both cast bodies will be supported on the pinemployed, which is not shown, in ejecting the castings and also infeeding the castings the same as taught in Figs. 2 and 3 of the drawing.The lower surface of the dies is preferably recessed as seen at 44 toreceive part of the cast bodies 33, 38 and to aid in supporting the samein the operation of trimming off the gate 40 and the gate 40a whichextends to the body 38, both of which gates are indicated in dottedlines in Fig. 7, simply to show their relationship to the cast bodyprior to being trimmed oi.

With the construction shown in Figs. 6 and 7 v of the drawing it will beunderstood that one cyl- ISU inder 31 will contain heated thermoplasticmaterial of one color and the other cylinder 31a, similar material ofanother color, so that the resulting unitary cast member comprising thebodies 33, 38 will have the two distinct colors arranged thereon.

It will.of course be understood that any desired contours may beprovided in the impressions 30, 39 so long as the contours are such asto permit separation of the die parts employed for the ejection of thecastings therefrom. It will also be apparent that when the ejector pinreceiving apertures 42, 43 are employed, it is not essential that theapertures 3I, 3Ia be employed, as the cast bodies may be formed the sameas in the structure shown in Figs. l to 5 inclusive.

Having fully described our invention, what we claim as new and desire tosecure by Letters Patent, is:

1. In a die casting machine, dies in which heated casting material maybe pressure injected,

said dies having adjacent abutting surfaces, each having two spacedimpressions therein cooperating to form two spaced casting cavities whensaid dies are in closed position, gate passages extending along saidsurfaces from the exterior of said dies to each of said cavities, one ofsaid cavities being larger than the other and having a contour such thata casting formed in said smaller cavity may be contained in said largercavity when said dies are closed, said adjacent abutting surfaces ofsaid dies also having recesses extending from said larger cavity to theexterior of said dies and positioned and arranged to receive at leastpart of the gate of a casting formed in the said smaller cavity whensuch casting is placed in said larger cavity.

2. In a die casting machine, dies in which heated casting material maybe pressure injected, said dies having adjacent abutting surfaces, eachhaving two spaced impressions therein cooperating to form two spacedcasting cavities when said dies are in closed position, gate passagesextending along said surfaces from the'exterior of said dies to each ofsaid cavities, one of said cavities being larger than the other andhaving a contour such that a casting formed in said smaller cavity maybe contained in said larger cavity when said dies are closed, saidadjacent abutting surfaces of said dies also having recesses extendingfrom said larger cavity to the exterior of said dies and positioned andarranged to receive at least part of the gate of a casting formed in thesaid smaller cavity when such casting is placed in said ,larger cavity,said gate passages being connected to each other along said adjacentsurfaces.

3. In a die casting machine, dies in which heated casting material maybe pressure injected, said dies having adjacent abutting surfaces, eachV,having two spaced impressions therein cooperating to form two spacedcasting cavities when said dies are in closed position, gate passagesextending along said surfaces from the exterior of said dies to each ofsaid cavities, one of said cavities being larger than the other andhaving a contour such that a casting formed in said smaller cavity maybe contained in said larger Icavity when said dies are closed, saidadjacent abutting surfaces of said dies also having recesses extend-

